1 / 7

Seismic Methods

Seismic Methods. EPJH Seismology Team Michael R. Brunt. Mercalli Scale. http://www.teachengineering.org/view_activity.php?url=http://www.teachengineering.org/collection/cub_/activities/cub_natdis/cub_natdis_lesson03_activity3.xml

elga
Télécharger la présentation

Seismic Methods

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Seismic Methods EPJH Seismology Team Michael R. Brunt

  2. Mercalli Scale • http://www.teachengineering.org/view_activity.php?url=http://www.teachengineering.org/collection/cub_/activities/cub_natdis/cub_natdis_lesson03_activity3.xml By rating earthquakes, engineers can predict which quakes are going to cause the most damage and warn humans about them. There are two commonly-used ways of rating earthquakes: 1) the Richter scale and 2) the Mercalli Scale. The Mercalli Scale was used earlier than the Richter Scale. It describes the damage left by an earthquake, not the actual force of the earthquake. The Mercalli Scale uses human observation to assess damage from an earthquake, while a Richter Scale uses instruments to measure how much force an earthquake produces, or the size of its waves. • Understand why seismologists/engineers develop rating scales for earthquakes. • Understand how a engineers/community could use the Mercalli Scale.

  3. Liquefaction • Liquefaction demonstration model • GEER: Post EQ reports • http://geerassociation.org/GEER_Post%20EQ%20Reports/Baja%20California_2010/Baja10_Ch05.html • http://geerassociation.org/GEER_Post%20EQ%20Reports/Darfield%20New%20Zealand_2010/Darfield_New%20Zealand_2010_index.html • http://geerassociation.org/GEER_Post%20EQ%20Reports/Haiti_2010/Haiti10_index.html

  4. Seismology and Engineering • Seismic methods principle A mechanical version of measuring the travel-time of waves propagating through the subsurface. • Seismic refraction The travel path of a wave through upper medium and along an interface (critical angle) and then back to the surface. • Environmental & Engineering communities • Seismic reflection The measure of the two-way travel time of waves that have been reflected off the subsurface interfaces between contrasting geological layers and back to the surface. • Oil & Gas industries • Earthquake & Tectonic studies

  5. Interpreting Earth’s Interior • Wave Propagation • Body Waves (P wave, S wave) • Surface Waves (Rayleigh, Love) • Seismic reflection • (Think: road cut)

  6. Field Trip: Day 1 • UTIG • Seismology Lecture • Walk-Run Activity • Triangulation Activity

  7. Field Trip: Day 2 • NEES • Engineering Lecture • Seismic Method activity Seismic reflection using vertical geophone(s) Impulse echo • Jackson School of Geosciences

More Related